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Finding the Fourth Proportional to 21,876.80, 32,821.04 and 8,738.40

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Solution

The fourth proportional to 21,876.80, 32,821.04 and 8,738.40 is: 13,109.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,876.80 : 32,821.04 = 8,738.40 : x
  2. Step 2: Convert to fraction form
    21,876.80/32,821.04 = 8,738.40/x
  3. Step 3: Cross multiply
    21,876.80x = 32,821.04 × 8,738.40
  4. Step 4: Simplify right side
    21,876.80x = 286,803,375.94
  5. Step 5: Solve for x
    x = 286,803,375.94/21,876.80
  6. Step 6: Final answer
    x = 13,109.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.